VintijDroidGutzz
Super Freak
Among the younger demographic specifically - sure.As far as R2 and 3PO popularity, it's always been pretty obvious that R2 is more popular over the past 30+ years. Do I have polls to back that up? No. But one only needs to look at the relative amount of product released bearing each likeness to tell where the marketroids lean. If you've collected product for a long time you may have noticed slower (peg-warmer) sell-through of 3PO figures. If you spend any time around kids you may find they associate much more with the shorter and more child-like R2 - this was the case 30 years ago with people I knew and is the case today with kids I know.
Given also R2's more complex accessory options and working hidden compartments, I think it would have made a great first impression.
I'm speaking broadly - I reckon they'd be about even.